I believe that Jones is 'the big mamma computer' of her own litlte clustuer of machines. As I understnad things, and I could be completly wrong, but as I understand things mysql and E-mail services are set up in clueseters to handle increased load.
I also do not belive that you can connect to your mysql server via it's IP address or host name through phpmyadmin. So, how do you get data into your new DH database and access it? If you can get by without using phpmyadmin you will be able to access your database via it's hostname from a shell prompt on your server. Your sites will alos be able to access the local database.
This is made possible by the fact that DH servers all check the local DNS first for an entry. So once you've added things through the panel, you can access them in the DH system.
If you need or want phpmyadmin you could set up two hostnames for your database and have one through dreamhosters.com. Also, let me make note that the point of setting up a mirrored subdomain of your new website here at dreamhost is for you to be able to access it via http and make sure that everything is making a smooth transition. You could avoid the entire sub-domain 'thing' and just add a few IPs to your local hosts file.
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